Yes, no kidding. The story of how this unusual collaboration between Herbie Hancock and rabbi’s son Jonathan Klein came about is told here:
And here is the actual album (recorded in a single 6-hour studio session):
Ron Carter – Bass; Phyllis Bryn-Julson – Contralto Vocals; Grady Tate – Drums; Jonathan Klein – French Horn, Saxophone [Baritone]; Herbie Hancock – Piano; Jerome Richardson – Flute, Saxophone [Alto, Tenor]; Antonia Lavanne – Soprano Vocals; Thad Jones – Trumpet, Flugelhorn; Rabbi David Davis – Voice [Reader], Other [Original Sleeve Notes]
Recorded in New York in 1968 and originally released on a private label.
[hat tip: Mrs. Arbel]